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I'm still not comfortable using any glycol based coolants on a race track (that's just me, if a track and org allow it i wont be get all uppity if someone is using it) so i'd have regular coolant in the bike, just 1L or so, during the winter and for the drive down there. When i got there i'd do a flush, fill it with water and WW. Before coming back dump the water, put that 1L or so of coolant back in, fire up the bike for 10-15 seconds then it'd be ok for the trip back North. A bit of a PITA for sure.
www.tt-racing.ca
AM #483 - 2010 ZX-10R.
Thanks to: Inglis Cycle Pro6 Cycle Armour Bodies PBI Sprockets Dunlop Motorcycle Blue Streak Racing VnM Sportgear
Normally, whatever small amount of water left in the system after draining it will only be partially sitting in low spots in the system, where the water isn't confined from expanding after it freezes. Only water that is confined and prevented from expanding as it freezes will be trouble.
It's just like an ice cube tray that you put in the freezer. The water expands as it freezes, but because it's an open tray, the remaining water that hasn't frozen, has someplace to go, so the tray doesn't break.
Some engines have multiple points to drain water out of. My FZR has a drain screw at the lowest point of the bottom water pipe, which empties out the water pump and radiator and most of the water out of the top end of the engine, but there is also a drain screw on each side in the bottom of the cooling jacket in the cylinder block (engine is tilted strongly forward in the chassis on that bike - these drains are at the bottom on the front) so that you can get that last bit of water out of the cooling jackets.
Even so, where I lived before, I stored the bike in an unheated garage and I only drained it at the main water pipe. Enough water drains out of the cylinder head and block so that there's air space left for the water to expand as it freezes. Never had a problem.
N/P as long as its just a bit it just freezes with no issue its just when the ice has no room to expand its a problem. Have done it many times with many different racebikes and never had a problem.
I was at Royal Whitby this morning they have a crapload on the shelf.
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